Unspecified vulnerability in the Calendar export feature in Moodle 1.8 before 1.8.8 and 1.9 before 1.9.4 allows attackers to obtain sensitive information and conduct "brute force attacks on user accounts" via unknown vectors.
http://www.openwall.com/lists/oss-security/2009/02/04/1
http://secunia.com/advisories/34418
http://lists.opensuse.org/opensuse-security-announce/2009-03/msg00004.html